gazelle/0064-lstack-support-low-power.patch

From 314689e509a2ddc491eb1bf6ecd40f1a8e6be3db Mon Sep 17 00:00:00 2001
From: jiangheng <jiangheng14@huawei.com>
Date: Thu, 14 Jul 2022 22:19:54 +0800
Subject: [PATCH 11/19] lstack support low power

---
 src/lstack/core/lstack_protocol_stack.c    | 57 ++++++++++++++--------
 src/lstack/include/lstack_ethdev.h         |  1 -
 src/lstack/include/lstack_protocol_stack.h |  1 +
 src/lstack/netif/lstack_ethdev.c           | 10 ----
 4 files changed, 38 insertions(+), 31 deletions(-)

diff --git a/src/lstack/core/lstack_protocol_stack.c b/src/lstack/core/lstack_protocol_stack.c
index 2acf77a..595b97e 100644
--- a/src/lstack/core/lstack_protocol_stack.c
+++ b/src/lstack/core/lstack_protocol_stack.c
@@ -132,9 +132,18 @@ struct protocol_stack *get_bind_protocol_stack(void)
     return stack_group->stacks[index];
 }
 
-void lstack_low_power_idling(void)
+static uint32_t get_protocol_traffic(struct protocol_stack *stack)
+{
+    if (use_ltran()) {
+        return rte_ring_count(stack->rx_ring) + rte_ring_count(stack->tx_ring);
+    }
+
+    /* only lstack mode, have not appropriate method to get traffic */
+    return LSTACK_LPM_RX_PKTS + 1;
+}
+
+void low_power_idling(struct protocol_stack *stack)
 {
-    static PER_THREAD uint32_t wakeup_flag = 0;
     static PER_THREAD uint32_t last_cycle_ts = 0;
     static PER_THREAD uint64_t last_cycle_pkts = 0;
     struct timespec st = {
@@ -147,14 +156,9 @@ void lstack_low_power_idling(void)
         set the CPU decentralization flag;
         2. If the number of received packets exceeds the threshold, the authorization mark will end;
         3. If the number of rx queue packets is less than the threshold, set the CPU delegation flag; */
-    if (get_global_cfg_params()->low_power_mod == 0) {
-        wakeup_flag = 0;
-        return;
-    }
-
-    if (eth_get_flow_cnt() < LSTACK_LPM_RX_PKTS) {
-        wakeup_flag = 1;
+    if (get_protocol_traffic(stack) < LSTACK_LPM_RX_PKTS) {
         nanosleep(&st, &st);
+        stack->low_power = true;
         return;
     }
 
@@ -165,18 +169,18 @@ void lstack_low_power_idling(void)
     uint64_t now_pkts = get_protocol_stack()->stats.rx;
     uint32_t now_ts = sys_now();
     if (((now_ts - last_cycle_ts) > LSTACK_LPM_DETECT_MS) ||
-        (wakeup_flag && ((now_pkts - last_cycle_pkts) >= LSTACK_LPM_PKTS_IN_DETECT))) {
-        if (!wakeup_flag && ((now_pkts - last_cycle_pkts) < LSTACK_LPM_PKTS_IN_DETECT)) {
-            wakeup_flag = 1;
-        } else if (wakeup_flag && ((now_pkts - last_cycle_pkts) >= LSTACK_LPM_PKTS_IN_DETECT)) {
-            wakeup_flag = 0;
+        ((now_pkts - last_cycle_pkts) >= LSTACK_LPM_PKTS_IN_DETECT)) {
+        if ((now_pkts - last_cycle_pkts) < LSTACK_LPM_PKTS_IN_DETECT) {
+            stack->low_power = true;
+        } else {
+            stack->low_power = false;
         }
 
         last_cycle_ts = now_ts;
         last_cycle_pkts = now_pkts;
     }
 
-    if (wakeup_flag) {
+    if (stack->low_power) {
         nanosleep(&st, &st);
     }
 }
@@ -221,16 +225,25 @@ static void* gazelle_wakeup_thread(void *arg)
     uint16_t queue_id = *(uint16_t *)arg;
     struct protocol_stack *stack = get_protocol_stack_group()->stacks[queue_id];
 
-    int32_t lcore_id = get_global_cfg_params()->wakeup[stack->queue_id];
+    struct cfg_params *cfg = get_global_cfg_params();
+    int32_t lcore_id = cfg->wakeup[stack->queue_id];
     thread_affinity_init(lcore_id);
 
+    struct timespec st = {
+        .tv_sec = 0,
+        .tv_nsec = 1
+    };
+
     LSTACK_LOG(INFO, LSTACK, "weakup_%02d start\n", stack->queue_id);
 
-    sem_t *event_sem[WAKEUP_MAX_NUM];
-    int num;
     for (;;) {
-        num = gazelle_light_ring_dequeue_burst(stack->wakeup_ring, (void **)event_sem, WAKEUP_MAX_NUM);
-        for (int i = 0; i < num; i++) {
+        if (cfg->low_power_mod != 0 && stack->low_power) {
+            nanosleep(&st, &st);
+        }
+
+        sem_t *event_sem[WAKEUP_MAX_NUM];
+        uint32_t num = gazelle_light_ring_dequeue_burst(stack->wakeup_ring, (void **)event_sem, WAKEUP_MAX_NUM);
+        for (uint32_t i = 0; i < num; i++) {
             sem_post(event_sem[i]);
         }
     }
@@ -423,6 +436,10 @@ static void* gazelle_stack_thread(void *arg)
         send_stack_list(stack, SEND_LIST_MAX);
 
         sys_timer_run();
+
+        if (get_global_cfg_params()->low_power_mod != 0) {
+            low_power_idling(stack);
+        }
     }
 
     return NULL;
diff --git a/src/lstack/include/lstack_ethdev.h b/src/lstack/include/lstack_ethdev.h
index 573a413..0e8400f 100644
--- a/src/lstack/include/lstack_ethdev.h
+++ b/src/lstack/include/lstack_ethdev.h
@@ -31,7 +31,6 @@ struct eth_dev_ops {
 
 int32_t ethdev_init(struct protocol_stack *stack);
 int32_t eth_dev_poll(void);
-uint32_t eth_get_flow_cnt(void);
 void eth_dev_recv(struct rte_mbuf *mbuf);
 
 #endif /* __GAZELLE_ETHDEV_H__ */
diff --git a/src/lstack/include/lstack_protocol_stack.h b/src/lstack/include/lstack_protocol_stack.h
index e5eedd7..0faeccf 100644
--- a/src/lstack/include/lstack_protocol_stack.h
+++ b/src/lstack/include/lstack_protocol_stack.h
@@ -45,6 +45,7 @@ struct protocol_stack {
     struct rte_ring *wakeup_ring;
     struct reg_ring_msg *reg_buf;
 
+    volatile bool low_power;
     volatile uint16_t conn_num __rte_cache_aligned;
     lockless_queue rpc_queue __rte_cache_aligned;
     char pad __rte_cache_aligned;
diff --git a/src/lstack/netif/lstack_ethdev.c b/src/lstack/netif/lstack_ethdev.c
index 7938520..0f30d76 100644
--- a/src/lstack/netif/lstack_ethdev.c
+++ b/src/lstack/netif/lstack_ethdev.c
@@ -111,16 +111,6 @@ int32_t eth_dev_poll(void)
     return nr_pkts;
 }
 
-uint32_t eth_get_flow_cnt(void)
-{
-    if (use_ltran()) {
-        return rte_ring_count(get_protocol_stack()->rx_ring) + rte_ring_count(get_protocol_stack()->tx_ring);
-    } else {
-        /* can't get flow cnt, lstack_low_power_idling don't use this params */
-        return LSTACK_LPM_RX_PKTS + 1;
-    }
-}
-
 static err_t eth_dev_output(struct netif *netif, struct pbuf *pbuf)
 {
     struct protocol_stack *stack = get_protocol_stack();
-- 
2.23.0